The Electronic Frontier Foundation and the ACLU of Wisconsin have petitioned the state supreme court to require law enforcement to obtain warrants before conducting retrospective searches of Automated License Plate Reader (ALPR) databases in Milwaukee, Racine, Kenosha, and Green Bay.
- Petition demands warrants for retrospective ALPR data searches in four Wisconsin cities.
- Law enforcement currently tracks private movements of individuals without individualized suspicion.
- Religious organizations emphasize privacy for sensitive expressive and community activities.
What happened
Today, EFF and the ACLU of Wisconsin filed a petition with the Wisconsin Supreme Court seeking a ruling that state constitutional protections require warrants for retrospective searches of law enforcement’s ALPR databases in Milwaukee, Racine, Kenosha, and Green Bay. This legal challenge is brought on behalf of the Wisconsin Council of Churches and an individual pastor, emphasizing concerns about privacy violations affecting religious gatherings and counseling.
The petition notes that ALPR systems capture extensive location data of drivers engaged in highly private activities, including attending medical appointments, recovery meetings, protests, and religious services. Law enforcement agencies collect, share, and aggregate this data, enabling detailed tracking of individuals’ past movements without a warrant or probable cause.
Why it matters
This case highlights a growing legal and privacy dilemma over mass surveillance tools like ALPR technology that allow law enforcement to bypass traditional individualized suspicion requirements. Warrantless retrospective searches of license plate data create a form of indiscriminate mass surveillance that threatens fundamental privacy rights.
For religious organizations and individuals, the implications are particularly serious as location privacy is critical to protect freedoms related to worship, pastoral care, confidential counseling, and political participation. Surveillance of such activities without judicial oversight undermines constitutional safeguards and the trust needed for these expressive associations.
What to watch next
The Wisconsin Supreme Court’s decision will be closely watched as it could set a precedent for the requirement of warrants before law enforcement can conduct retrospective ALPR searches, potentially reshaping privacy protections across the state and beyond. This case follows a growing national discourse and recent federal rulings addressing the constitutionality of warrantless ALPR surveillance.
Advocates hope the court will affirm strong privacy rights, reinforcing limits on mass surveillance and upholding individualized suspicion standards. The outcome may influence other jurisdictions grappling with the balance between public safety interests and privacy in the era of advanced location tracking technologies.